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#1
04-11-2018, 01:59 PM
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Zenith 20Y1C50 broken again
Yesterday, I decided to put the original picture tube back in my 1968 Zenith 20Y1C50 set, and everything went perfectly. Not a single headache, and I had the thing back up and running in an hour, and only half an hour to do purity and convergence. So I get up this morning, and it still works, but when I go to adjust the brightness, the act of simply touching the brightness control kills the luminance. There is very little luminance/brightness. Almost like the potentiometer is stuck at 1/4 of the way up. Again, it was working perfectly when I put it back together yesterday.
Last edited by TUD1; 04-22-2018 at 03:01 PM. 
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#2
04-11-2018, 07:01 PM
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Bad control, tin whiskers in control, bad connection to control...Those would be my first 3 checks.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#3
04-11-2018, 08:55 PM
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Loss of luma can be caused by dirty service switch or H-K short in CRT. Hope it ain't the latter. Tap on CRT neck to see.
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#6
04-13-2018, 10:42 AM
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So glad it was an easy fix!
__________________
[B]"Bee care-eh-full to don't broke thee pic-sher tee-yube!" :-)
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Linear Mode
